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After running a reaction and separating her product, Katya Sheridan left the reaction’s waste in a flask. Overnight, these brilliant Aloe vera–shaped crystal formed. Sheridan, an undergraduate student working in the lab of Christopher Hobbs at Sam Houston State University, was using the nitroso-Diels-Alder reaction to synthesize new monomers for ring-opening metathesis aiming to create and modify polymeric materials.